求助一道 数学

西风瘦马

Q9: A gardener is going to plant 2 red rosebushes and 2 white rosebushes.If the gardener is to select each of the bushes at radom,one at a time,and plant them in a row, what is the probability that the 2 rosebushes in the middle of the row will be the red rosebushes? A1/12 B1/6 C1/5 D1/3 E1/2 In my opinion

这个题式子该怎莫列，中间怎莫表示呢？望NN解答

skidrow

B 吧    C（4 2）=6 总共有6种可能 中间2个是红的 就是 其中的一种可能

1/6